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Updated at 17/06/2025 10:30:15(UTC+8)

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Description

The LM3489MM is a high efficiency PFET Switching Regulator Controller with enable pin. It can be used to quickly and easily develop a small, cost effective, switching buck regulator for a wide range of applications. The hysteretic control architecture provides for simple design without any control loop stability concerns using a wide variety of external components. The PFET architecture also allows for low component count as well as ultra-low dropout, 100% duty cycle operation. Another benefit is high efficiency operation at light loads without an increase in output ripple. A dedicated Enable Pin provides a shutdown mode drawing only 7µA. Leaving the Enable Pin unconnected defaults to on. Current limit protection can be implemented by measuring the voltage across the PFET"s RDS(ON), thus eliminating the need for a sense resistor. A sense resistor may be used to improve current limit accuracy if desired.
Easy to use control methodology
No control loop compensation required
93% High efficiency
Current limit protection
Dedicated enable pin (on if unconnected)
Shutdown mode draws only 7µA Supply current
Device has limited built-in ESD protection, leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.

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LM3489MM Specifications

Attribute	Attribute Value

Datasheet	Datasheet
3D Model	3D Model
Mounting Style	Surface Mount
Number of Pins	8 Pin
Case/Package	VSSOP-8
Frequency	1.00 MHz
Supply Voltage (DC)	4.50V (min)
Number of Outputs	1 Output
Output Voltage	1.239V ~ 35V
Output Current	4 A
Number of Channels	1 Channel
Number of Positions	8 Position
Power Dissipation	417 mW
Quiescent Current	280 µA
Number of Regulated Outputs	1 Output
Switching Frequency	1 MHz
Topology	Buck
Duty Cycle	100 %
Input Voltage (Max)	35 V
Input Voltage (Min)	4.5 V
Maximum Duty Cycle	1
Operating Temperature (Max)	125 ℃
Operating Temperature (Min)	-40 ℃
Power Dissipation (Max)	417 mW
Supply Voltage	4.5V ~ 35V
Supply Voltage (Max)	35 V
Supply Voltage (Min)	4.5 V
Input Voltage	4.5V ~ 35V
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Operating Temperature	-40℃ ~ 125℃ (TJ)
Product Lifecycle Status	Active
Packaging	Tape & Reel (TR)
RoHS	Non-Compliant
Lead-Free Status	Contains Lead
REACH SVHC Compliance	No SVHC
REACH SVHC Compliance Edition	2015/06/15

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